15586 Players currently online!
Man vs. Machine - good luck!
Turn-based games at any time!
Vote for the best move to win!
Do you have what it takes?
Backgammon, Yatzy, and more!
Sharpen your tactical vision!
Get advice and game insights!
Learn from top players & pros!
View millions of master games!
Your virtual chess coach!
Perfect your opening moves!
Test your skills vs. computer!
Find the right private coach!
Can you solve it each day?
Bring it all together!
Beginners, start here!
Make friends & play team games!
News from the world of chess!
Search all Chess.com members!
Find local clubs & events!
Who's the best of your friends?
Read what members are saying!
I can't move any white piece!
Correct. It is set up as a diagram, not an interactive puzzle.
Qb6! forces axb6 and mate
Almost ... but white has axb6.
What was black's last move?
Apperantly it could only have been b7-b5. And then you have a solution.
However, after retracting b7-b5 I can see no legal move to retract for white. Even if there was a white knight on a3.
Good catch. The problem is solveable as given, but I don't want this flaw in it. Let's try this version:
Surprisingly, the position still seems illegal. The reason is that white's pawns must have made at least 7 captures. A quick count shows that black is missing 7 pieces. But... if the last move was b7-b5 then of coures, the bishop on c8 couldn't have been captured by a pawn.
Very easy to fix though. Just edit the position and remove the a2 pawn (not sure why it's there in the first place as it is not needed, maybe just an oversight).
The solution of course would be:
1. axb6+! en passent (black must have played b7-b5 the move before) 1... Qxc4#.
No, this is all intentional. If all I wanted was a selfmate by en passant, I would remove many more pieces besides Pa2. To be fair, I should mention that I am violating a certain chess.com convention. But I am conforming to the rules of chess.
In a selfmate you force your opponent to checkmate you.
Maybe I'm mistaken, but perhaps the trick is that because black has no legal last move, it must be black to move? And then the solution is 1... Nb7+.
By the way if this is the case, I have found a way to post a position withought elaborating on which side is to move. Simply choose "Game or sequence of moves", and make sure not to put any moves in. That works!
Qb7, which forces Nxb7#.
That's not mate, since white can play 2. cxb7+.
Yes, that's the intended solution. Retro-analysis proves that black has the move, so it has to be 1...Nb7+.
The other benefit, since the FEN is hidden like this, is that castling and en passant rights are also unknown
hmm well, is the solution a5 e.p. b5 with check bc4, rxc4?
axb5 en passant?
GAH necro plus lack of thinking. When you see this sort of ridiculous position with ridiculous conditions, your first thought should be "retrograde puzzle". Solution (shoopi got it first a long time ago) as follows.
If it's black to move, solution is 0...Nb7+ 1. cxb7#. No issues here as white can retract, say wPe4xbNd5.
If it's white to move, black must have moved last ...b7-b5 (since any other black last move gives impossible check situations) and white goes 1. axb6+ e.p. Qxc4#. Now, why is this wrong?
White's pawns must have made at least 7 captures (for instance bxa, cxbxa, exdxc, fxexd.) Now, at first glance black is missing exactly seven men (3P, N, 2B, R) so it seems possible, BUT since black only just played ...b7-b5, black c8-bishop couldn't have escaped and was captured on its home square! So white's pawns could only have taken 6 men and the position is impossible (with white to move.)
Therefore, in the diagram it is black to move, and the solution is after all 0...Nb7+ 1. cxb7#.
What Does 'Chess is 99% Tactics' Mean??
by BlargDragon 4 minutes ago
Crying of resigning
by With_every_step 5 minutes ago
10/28/2016 - Four Way Street
by johngensler 7 minutes ago
I be your computer now what
by BlargDragon 10 minutes ago
My First Real Life Tournament Results
by Atomic_Rift 11 minutes ago
Have to stop this loser from heckling at me
by spins5mE 18 minutes ago
Instant IP-ban for cheaters.
by fuzzbug 19 minutes ago
Reporting forum post violations
by jdcannon 20 minutes ago
Official World Championship Prediction Thread - #CarlsenKarjakin
by StephenCorelli 21 minutes ago
How a Phony 18th Century Chess Robot Fooled the World
by batgirl 21 minutes ago
Why Join | Chess Topics |
Help & Support |
© 2016 Chess.com
• Chess - English
Try the new Chess.com!
We are working hard to make Chess.com available in over 70 languages. Check back over the year as we develop the technology to add more, and we will try our best to notify you when your language is ready for translating!